Nilfisk-ALTO NEPTUNE 4 FA Service Manual page 34

Indication lights
 Motor overheated
 Machine overheated
 Flame sensor sooted
 Ignition or fuel system failure
Fault
Pressure too low
Machine is running with
pulsating pressure and
makes knocking noise
No detergents drawn in
Burner soots
NEPTUNE 4 FA_EN_Ver.2.0_ 22/11
Troubleshooting
Cause
Cause
 High pressure nozzle worn out
 Pressure regulation set to low pressure or
VarioPress-lance set to low water vol-
ume.
 Pump has drawn in air as the detergent
tank is empty.
 Detergent tank empty
 Dirt in detergent tank
 Suction valve at cleaning agent inlet
soiled
 Fuel contamination
 Burner sooted or adjustment incorrect
Flashing light (alternately)
 Turn main switch in position "OFF", let the machi-
ne cool down
 Remove/disconnect extension cable
 Possible phase failure; have electrical connection
checked
 Contact Nilfisk-ALTO Service
Flashing light
 Clean flame sensor
 Contact Nilfisk-ALTO Service
Cold water operation possible
 Replace nozzle
 Turn the twist grip on safety control block
clockwise (+) or set VarioPress-lance to
higher water volume.
 Close detergent valve. Remove lance from
gun. Operate spray gun and let machine run
until air in pump is gone and the machine is
running normally/calm again.
 Top up detergent tank
 Clean detergent tank
 Remove suction valve and clean or replace
 Contact Alto Service
 Contact Alto Service
Remedy
Remedy
E
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